fcc week 2015 program of i&o presentations ph. lebrun 25 february 2015

FCC Week 2015Program of I&O presentations

Ph. Lebrun

25 February 2015

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FCC Week I&O Program 2

FCC Week 2015

Ph. Lebrun & P. Collier


FCC Week I&O Program 3Ph. Lebrun & P. Collier



I&O plenary talksMonday 23 March 2015

• FCC Infrastructure & Operation studies: progress and outlook (Ph. Lebrun)– Abstract: In complement to the largely site-independent accelerator science and

technology study for Future Circular Colliders (FCC), the infrastructure necessary for implanting such machines in the neighbourhood of CERN is being studied, together with their operational aspects as part of the future accelerator complex. Main issues identified and progress made on possible solutions since the kick-off of the study in February 2014 will be presented, in domains as diverse as geology and civil engineering, utilities, cryogenic refrigeration, control concepts, machine integration, logistics and installation, reliability and availability, power and energy consumption as well as conventional and radiological safety.

• Evolution of a global HEP computing infrastructure towards FCC (I. Bird)– Abstract:




4 sessions of 1h30 on Thursday 26 March




08h30-10h00 [1/2]4 talks of 18+4 min

• Civil engineering and geology (J. Osborne)– Abstract: The feasibility of an 80 km-10 0km tunnel to house the Future Circular

Colliders (FCC) is currently under investigation at CERN. This presentation describes how CERN’s civil engineering team are investigating the optimal position for such a new machine in the Geneva area. The first results from a bespoke interactive tool, containing a 3D geological model of the Geneva basin, are presented.

• Transport & handling considerations for FCC (I. Ruehl)– Abstract: The logistics regarding material flow and people access of any accelerator

in underground areas is a challenging factor that has an important impact during the installation as well as during the operation phase. The FCC layout with important shaft depths and large distances between the shafts presents an unequalled challenge in this respect. The paper will describe some first preliminary transport and handling studies regarding available lift, crane and tunnel transport technologies, their feasibility, their limitations and layout configurations. The findings will have a direct impact on the logistical aspects and consequently on the intervention / installation time of FCC as well as on the civil engineering layout of buildings, shafts, underground caverns and tunnels, which will consequently have an important impact on the costs.




08h30-10h00 [2/2]4 talks of 18+4 min

• A key quality attribute of a Future Circular Collider: availability performance (RAMS) (P. Sollander)– Abstract: Reliability and availability become key indicators for the performance of

accelerators when integrated luminosity cannot be increased by higher peak luminosity. Grossly scaling downtime from equipment faults seen on CERN’s Large Hadron Collider to FCC by a factor four suggests that the FCC could do no physics at all. A study is started to assess if methods and tools successfully used to improve reliability and availability in large industrial and governmental projects could be applied to accelerator projects. A collaboration with the Tampere University of Technology who has already made reliability studies for oil rigs, nuclear waste management and military systems will help assess the applicability by modelling an existing accelerator and validating the model with physics data.

• Energy and power estimates (R. Steerenberg)– Abstract:




10h30-12h00 [1/2]4 talks of 18+4 min

• Cryogenics (L. Tavian)– Abstract: The cryogenic system of FCC-hh and FCC-ee will require unprecedented

cooling capacity to be transported over unprecedented distances. The corresponding project study has challenged the cryogenic community and triggered specific studies in order to conceptually design the cryogenic systems and to identify the limitations of the present state-of-the-art as well as the developments which will be needed to fulfil the FCC requirements. This presentation will recall the main challenges of the FCC cryogenics and will show the corresponding study organization and roadmap towards the conceptual design report. Preliminary results will be also presented.

• Large-capacity helium refrigeration: from state-of-the-art towards FCC reference solutions (F. Millet)– Abstract: Large unit-capacity cryogenic plants are required to cool high-field

superconducting magnets of FCC-hh, high-gradient superconducting RF cavities of FCC-ee as well as for the cooling above 40 K of heavily-loaded FCC-hh beam screens, thermal shields and current leads. Such cryogenic plants require (1) unit refrigeration capacity 3 to 4 times larger than the present state-of-the-art (FCC-hh), (2) non-conventional thermal load distribution with very large synchrotron radiation to the beam screens (FCC-hh) and (3) high-efficiency and high-reliability to minimise the operation cost and to increase the overall availability of the future accelerator complex. A preliminary review of the state-of-the-art of large-capacity helium plants will be presented and the roadmap to define reference solutions for the FCC cryogenic plants will be proposed.




10h30-12h00 [2/2]4 talks of 18+4 min

• Cryogenic refrigeration with neon-helium mixtures: roadmap and first results of TU Dresden study (S. Klöppel et al.)– Abstract: At an early stage of the FCC evaluation the heat load caused by

synchrotron radiation and the necessity of a beam screen cooling had been identified as a major issue. For a number of reasons and restrictions the beam screens must be kept within between 40 and 60 K. For FCC-hh the heat load including the respective thermal shields piles up to 500 kW + 70 kW = 570 kW for each of the 12 sectors. An important aspect is the hydraulic impedance of the beam screen, presently assumed to be equivalent to 230 straight pipes of 5.55 mm inner diameter and 30 m in length per sector. A highly efficient cooling plant is pursued. As a novel approach, the use of a helium-neon mixture as refrigerant was found advantageous. Especially promising is the possible substitution of oil flooded screw compressors by more efficient turbo compressors. This presentation investigates different flow schemes and mixtures compositions with respect to complexity and efficiency. Furthermore, thermodynamic aspects, e.g. whether to use cold or warm secondary cycle compressors are discussed.

• Cooling the FCC beam screens (L. Tavian)– Abstract: The high-energy hadron beam of FCC-hh will generate up 28 W/m of

synchrotron radiation for the 100-km circumference tunnel and up to 44 W/m for the 80-km circumference option. This specific heat load is more intense with respect to the LHC by more than 2 orders of magnitude. Therefore, beam screens are definitely mandatory to absorb the synchrotron radiation at higher temperature than that of the superconducting magnets and thus reduce the entropic load on the refrigeration system. After explaining the main cooling constraints of the beam screens, this presentation will give a preliminary design of the beam-screen cooling loop using helium or neon, for different cooling channel geometry with emphasis on cooling length limitations and exergetic efficiency.




13h30-15h00 [1/3]4 talks of 18+4 min

• Control concepts for future circular accelerators: why it is not too early to speak about them (Ph. Gayet)– Abstract: Control and data acquisition systems for accelerators, detectors and

infrastructure are traditionally considered as independent, loosely coupled, process- or equipment- specific and consequently should rely on different technical and architectural solutions. However, the experience acquired with the LHC has shown that common solutions can successfully be applied resulting in significant cost and manpower savings. Therefore a study is launched to identify the commonalities and specificity of the Future circular collider (FCC) controls and data acquisition systems together with an assessment of the key numbers relevant for estimating cost and risk. After a brief recall of the control and data acquisition duties, this presentation is twofold. First we conduct a comparative review of the LHC and potential FCC systems in order to identify similarities and differences , to extrapolate the key numbers for FCC and to present the areas of required research and development. Second we would like to present a cooperation model where the various developments and innovative ideas related to the control and data acquisition systems could be shared, evaluated and promoted, from this early stage of the project.




13h30-15h00 [2/3]4 talks of 18+4 min

• Lessons learnt and new concepts for conventional safety in FCC (A. Henriques)– Abstract: Future Circular Colliders (FCC) under study at CERN will face conventional

safety challenges throughout their life-cycle, from fire prevention in an unprecedented large underground facility to environmental protection in the surroundings. Studies are being performed in order to propose risk prevention and mitigations measures to achieve an acceptable risk level and ensure the safe operation of the installation. Such a project with new machines, underground infrastructure and layouts offers the opportunity to study new ideas, first based on lessons learnt from former or present facilities and second based on new concepts to improve safety. The main domains for conventional Safety in similar installations, e.g., air management, oxygen-deficiency hazard, static confinement and fire compartments, will be assessed in this presentation together with the integration of new concepts, e.g. smoke extraction and egress. The direction shall aim towards an “optimal solution” with respect to safety and its importance to anticipate future advancements in technology.




13h30-15h00 [3/3]4 talks of 18+4 min

• Optimised civil engineering layout for radiation protection in FCC (M. Widorski)– Abstract: The framework and concepts of radiological protection have evolved

considerably over the last 30 years. In parallel, the technological and organisational tools have developed fast as in many other technical domains. The CERN study of Future Circular Colliders (FCC) gives us the opportunity to apply these for radiological optimisation from the very beginning in the conceptual phase of this project. The radiation protection measures to protect the personnel and the environment are numerous. They need to be applied from the design to the decommissioning phase covering control and minimisation of stray radiation and the production of radioactivity, maintenance and intervention optimisation to reduce doses to the personnel and the final decommissioning and disposal concepts for the produced radioactive material. Awareness for these questions by accelerator and experiment designers is of crucial importance for a successful implementation of radiation protection at the FCC. A focus in the study phase is directed towards an optimised civil engineering layout. Optimal access and working conditions for the personnel and the implications for an ideal air management have to be taken into consideration. The presentation will outline basic guidelines and parameters important to radiological protection.

• Discussion




15h30-17h00

• This session, originally allocated to I&O, is now reserved for contributed short communications from institutes participating to the FCC study



fcc week 2015 program of i&o presentations ph. lebrun 25 february 2015

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